object ScalaVarDemo02 {
  def main(args: Array[String]): Unit = {
    var age = 18
    age = 19
    val sal = 200
    val dog = new Dog()
    println(dog.age)
    println(dog.name)
  }
}
class Dog {
  var age: Int = _
  var name: String = "小花"
}
